PLC之间的通讯网络是各厂家专用的,PLC与计算机之间的通讯,一些生产厂家采用工业标准总线,并向标准通讯协议靠拢,这将使不同机型的PLC之间、PLC与计算机之间可以方便地进行通讯与联网。
了解了PLC的基本结构,我们在购买程控器时就有了一个基本配置的概念,做到既经济又合理,尽可能发挥PLC所提供的佳功能。
基本指令系统特点
PLC的编程语言与一般计算机语言相比,具有明显的特点,它既不同于语言,也不同与一般的汇编语言,它既要满足易于编写,又要满足易于调试的要求。目前,还没有一种对各厂家产品都能兼容的编程语言。如三菱公司的产品有它自己的编程语言,OMRON公司的产品也有它自己的语言。但不管什么型号的PLC,其编程语言都具有以下特点:
ABB Welding Isolation Contactor A300W-20 400AMP
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ABB block CONTACTOR A185-30-11-84 NEW
ABB DSQC 241 S3 Power Supply YB560103-CL
ABB Welding Isolation Contactor A300W-30 400AMP
LOT OF 2 ABB CONTACTOR EH 170C-1 EH170C 300A EH170
Fleurco ABB36 Acrylic Base, Buscuit or White Color
ABB M2AA 132 M Motor =
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ACS550-U1-015A-4
ABB SACE S6 S6N S6N600TW-2BAS7 600AMP Circuit Breaker
NEW FITS ABB/ASEA REPLACEMENT CONTACT KITS KZ550 EH550
SIEMENS 1FT3074 ABB 3H-AA-0001-EF SIMODRIVE SERVO MOTOR
AB 1326AB-B515G-21 1326ABB515G21 SERVO MOTOR 460V
ABB 698B076U77 CONVERTER MINIMAG COPA X ASSEMBLY
ABB ACS143-4K1-3-U 480V SERVO DRIVE NEW
NEW FITS ABB EH210 EH 210 CONTACTOR AC COIL
ABB MMCO MULTIPHASE OVERCURRENT RELAY MAZZ5Z3GC1 (NEW)
ABB NAMC-11C Free Ship
TAYLOR ABB MOD 300 TRANSFER MODULE 6215BZ10000
YASKAWA SGMG-09A2ABB AC SERVO MOTOR *NNB*
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ASEA Brown Boveri, ABB DSCA 121
ASEA Brown Boveri, ABB DSDX 110
ASEA Brown Boveri, ABB DSQC 123B with DSQC 130
ASEA Brown Boveri, ABB DSQC 123B with DSQC 130
ABB ASC400 AC DRIVE ASC401600435 380-480V,4.9-6.6 AMP
ABB inverter ACS 143-K75-3-C ACS143-K75-3-C
ABB 3BSE040360R41 Compact Control Builder CD license
NEW ABB Welding Isolation Contactor EHW 250, #15246
ABB SM1000 SM1006S HMI Operator Panel Display Monitor
ABB Pole Mounted Transformer, 50 KVA, New